// Implements major type 6 encoding per https://tools.ietf.org/html/rfc7049#section-2.1
/// <summary>
/// Assign a semantic tag (major type 6) to the next data item.
/// </summary>
/// <param name="tag">The value to write.</param>
/// <exception cref="InvalidOperationException">
/// Writing a new value exceeds the definite length of the parent data item. -or-
/// The major type of the encoded value is not permitted in the parent data item. -or-
/// The written data is not accepted under the current conformance mode.
/// </exception>
public void WriteTag(CborTag tag)
{
if (!CborConformanceModeHelpers.AllowsTags(ConformanceMode))
{
throw new InvalidOperationException(SR.Format(SR.Cbor_ConformanceMode_TagsNotSupported, ConformanceMode));
}
WriteUnsignedInteger(CborMajorType.Tag, (ulong)tag);
_isTagContext = true;
}
private void WriteStartArrayIndefiniteLength()
{
if (!ConvertIndefiniteLengthEncodings && CborConformanceModeHelpers.RequiresDefiniteLengthItems(ConformanceMode))
{
throw new InvalidOperationException(SR.Format(SR.Cbor_ConformanceMode_IndefiniteLengthItemsNotSupported, ConformanceMode));
}
EnsureWriteCapacity(1);
WriteInitialByte(new CborInitialByte(CborMajorType.Array, CborAdditionalInfo.IndefiniteLength));
PushDataItem(CborMajorType.Array, definiteLength: null);
}
// Implements major type 7 encoding per https://tools.ietf.org/html/rfc7049#section-2.1
/// <summary>Writes a single-precision floating point number (major type 7).</summary>
/// <param name="value">The value to write.</param>
/// <exception cref="InvalidOperationException"><para>Writing a new value exceeds the definite length of the parent data item.</para>
/// <para>-or-</para>
/// <para>The major type of the encoded value is not permitted in the parent data item.</para>
/// <para>-or-</para>
/// <para>The written data is not accepted under the current conformance mode.</para></exception>
public void WriteSingle(float value)
{
if (!CborConformanceModeHelpers.RequiresPreservingFloatPrecision(ConformanceMode) &&
TryConvertSingleToHalf(value, out var half))
{
WriteHalf(half);
}
else
{
WriteSingleCore(value);
}
}
/// <summary>
/// Writes a double-precision floating point number (major type 7).
/// </summary>
/// <param name="value">The value to write.</param>
/// <exception cref="InvalidOperationException">
/// Writing a new value exceeds the definite length of the parent data item. -or-
/// The major type of the encoded value is not permitted in the parent data item. -or-
/// The written data is not accepted under the current conformance mode
/// </exception>
public void WriteDouble(double value)
{
if (!CborConformanceModeHelpers.RequiresPreservingFloatPrecision(ConformanceMode) &&
FloatSerializationHelpers.TryConvertDoubleToSingle(value, out float single))
{
if (FloatSerializationHelpers.TryConvertSingleToHalf(single, out Half half))
{
WriteHalf(half);
}
else
{
WriteSingleCore(single);
}
}
else
{
WriteDoubleCore(value);
}
}
/// <summary>Writes a simple value encoding (major type 7).</summary>
/// <param name="value">The value to write.</param>
/// <exception cref="ArgumentOutOfRangeException">The <paramref name="value" /> parameter is in the invalid 24-31 range.</exception>
/// <exception cref="InvalidOperationException">Writing a new value exceeds the definite length of the parent data item.
/// -or-
/// The major type of the encoded value is not permitted in the parent data item.
/// -or-
/// The written data is not accepted under the current conformance mode.</exception>
public void WriteSimpleValue(CborSimpleValue value)
{
if (value < (CborSimpleValue)CborAdditionalInfo.Additional8BitData)
{
EnsureWriteCapacity(1);
WriteInitialByte(new CborInitialByte(CborMajorType.Simple, (CborAdditionalInfo)value));
}
else if (value <= (CborSimpleValue)CborAdditionalInfo.IndefiniteLength &&
CborConformanceModeHelpers.RequireCanonicalSimpleValueEncodings(ConformanceMode))
{
throw new ArgumentOutOfRangeException(SR.Format(SR.Cbor_ConformanceMode_InvalidSimpleValueEncoding, ConformanceMode));
}
else
{
EnsureWriteCapacity(2);
WriteInitialByte(new CborInitialByte(CborMajorType.Simple, CborAdditionalInfo.Additional8BitData));
_buffer[_offset++] = (byte)value;
}
AdvanceDataItemCounters();
}
// Unsigned integer decoding https://tools.ietf.org/html/rfc7049#section-2.1
private ulong DecodeUnsignedInteger(CborInitialByte header, ReadOnlySpan <byte> data, out int bytesRead)
{
ulong result;
switch (header.AdditionalInfo)
{
case CborAdditionalInfo x when(x < CborAdditionalInfo.Additional8BitData):
bytesRead = 1;
return((ulong)x);
case CborAdditionalInfo.Additional8BitData:
EnsureReadCapacity(data, 1 + sizeof(byte));
result = data[1];
if (result < (int)CborAdditionalInfo.Additional8BitData)
{
ValidateIsNonStandardIntegerRepresentationSupported();
}
bytesRead = 1 + sizeof(byte);
return(result);
case CborAdditionalInfo.Additional16BitData:
EnsureReadCapacity(data, 1 + sizeof(ushort));
result = BinaryPrimitives.ReadUInt16BigEndian(data.Slice(1));
if (result <= byte.MaxValue)
{
ValidateIsNonStandardIntegerRepresentationSupported();
}
bytesRead = 1 + sizeof(ushort);
return(result);
case CborAdditionalInfo.Additional32BitData:
EnsureReadCapacity(data, 1 + sizeof(uint));
result = BinaryPrimitives.ReadUInt32BigEndian(data.Slice(1));
if (result <= ushort.MaxValue)
{
ValidateIsNonStandardIntegerRepresentationSupported();
}
bytesRead = 1 + sizeof(uint);
return(result);
case CborAdditionalInfo.Additional64BitData:
EnsureReadCapacity(data, 1 + sizeof(ulong));
result = BinaryPrimitives.ReadUInt64BigEndian(data.Slice(1));
if (result <= uint.MaxValue)
{
ValidateIsNonStandardIntegerRepresentationSupported();
}
bytesRead = 1 + sizeof(ulong);
return(result);
default:
throw new CborContentException(SR.Cbor_Reader_InvalidCbor_InvalidIntegerEncoding);
}
void ValidateIsNonStandardIntegerRepresentationSupported()
{
if (_isConformanceModeCheckEnabled && CborConformanceModeHelpers.RequiresCanonicalIntegerRepresentation(ConformanceMode))
{
throw new CborContentException(SR.Format(SR.Cbor_ConformanceMode_NonCanonicalIntegerRepresentation, ConformanceMode));
}
}
}
